Their main job involves installing a pair of high-definition TV cameras. The cameras are meant to provide sharp views of commercial crew capsules coming in to dock.

Until SpaceX and Boeing start flying astronauts, NASA must rely solely on Russian capsules for getting to and from the 250-mile-high outpost. The Russians rides are costing NASA up to $82 million per person.

NASA hasn’t launched astronauts into space from U.S. soil since the last shuttle flight in 2011. SpaceX and Boeing are aiming for test flights from Cape Canaveral, Florida, by year’s end.